* {
    margin: 0;
    padding: 0;
}
li {
    list-style: none;
}
body {
    width: 100%;
    min-width: 320px;
    max-width: 640px;
    margin: 0 auto;
    font-size: 14px;
    font-family: -apple-system, Helvetica, sans-serif;
    color: #666;
    /* background-color: #666666; */
    height: 1000px;
}
.app {
    width: 100%;
    height:45px;
    background-color: #333333;
}
.app ul {
    margin: 0;
}
.app ul li {
    float: left;
    height: 45px;
    line-height: 45px;
    text-align: center;
  
    color: #fff;
}
.app ul li:first-child img {
    width: 10px;
    height: 10px;
}
.app ul li:nth-child(2) img {
    width: 30px;
    height: 30px;
    vertical-align: middle;
   
}
.app ul li:nth-child(1) {
    width: 8%;
    
}
.app ul li:nth-child(2) {
    width: 10%;
  
}
.app ul li:nth-child(3) {
    width: 57%;

}
.app ul li:nth-child(4) {
    width: 25%;
    background-color: #F63515;
}
/* search========================================================== */
.search {
    position: fixed;
    top: 38px;
    width: 100%;
    height: 44px;
    color: #fff;
    overflow: hidden;
}

.menu {
    position: absolute;
    left: 0;
    top: 0;
    width: 40px;
    height: 44px; 
}
.menu::before {
    content: "";
    position: absolute;
    left: 60%;
    top: 50%;
    transform: translate(-50%,-50%);
    width: 20px;
    height: 18px;
    background-color: rgba(124, 124, 165, 0.322);
    background: url(../images/s-btn.png ) no-repeat;
    background-size: 20px 18px;
}
.search-in {
    margin: 7px 50px 0 50px;
    height: 30px;
    background-color: rgb(255, 255, 255);
    border-radius: 15px; 
    line-height: 30px;
    text-align: center;
    color: #666666;
}
.search-in .icon {
    position: absolute;
    left: 60px;
    top: 50%;
    transform: translate(0,-50%);
    width: 20px;
    height: 15px;
    background: url(../images/jd.png);
    background-size: 20px;
}
.search-in::after {
    content: "";
    position: absolute;
    left: 90px;
    top: 50%;
    transform: translate(0,-50%);
    width: 0px;
    height: 15px;
    border: 0.5px solid #ccc;
}
.search-in::before {
    content: "";
    position: absolute;
    left: 100px;
    top: 50%;
    transform: translate(0,-50%);
    width: 18px;
    height: 15px;
    background: url(../images/jd-sprites.png) no-repeat -81px 0;
    background-size: 200px;
}
.search-in input {
    outline-style: none;
    border: none;
    margin: 0 70px;
}
.login {
    position: absolute;
    right: 0;
    top: 0;
    width: 40px;
    height: 44px;
    line-height: 44px;  
}
/* banner========================================= */
.banner img {
    display: block;
    width: 100%;
    height: 183px;
}
.brand img {
    display: block;
    float: left;
    width: 33%;
    height: 99px;
}
/* nav============================== */
.nav li {
    float: left;
    width: 20%;
    height: 81px;
    box-sizing: border-box;
}
.nav li:nth-child(-n+5) {
    margin-top: 8px;
}
.nav li img {
    width: 40px;
    height: 40px;
    margin: 5px 20px;
    text-align: center;
}
.nav li span {
    margin: 0 8px;
    color: #666;
}
.nav li a {
    display: inline-block;
    width: 100%;
    height: 100%;
    background-color: #fff;

}
/* news============================ */
.news {
    margin-top: 10px;
}
.news img {
    display: block;
    vertical-align: middle;
    width: 100%;
    height: 100%;
}
.news a:nth-child(-n+3) {
    display: inline-block;
    float: left;
    width: 25%;
    height: 120px;
}
.news a:nth-child(1) {
    width: 49%;
}
.news a:nth-child(2) {
    border-right: 1px solid rgb(211, 209, 209); 
    border-left: 1px solid rgb(211, 209, 209); 
}
